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T. T. ANDRESIAK.

ADJUSTABLE nRAwmG BOARD BRACKET.

APPLICATION FILED SEPT. l?. |918.

'Patented Nov. 4, 1919.

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Patente Nov. 4, 1919.

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a anni ADJUSTABLE-DRAWINGj-BOARD BRACKET.

Specification of Letters Patent.

Patented Nov. 4, 1919.

Application filed September 17, 1918. Serial No. 254,506.

To all whom it may concern.' v

Be it known that I, Trinononn T. ANDRE- SIAK, a citizen of the United States, and a resident of South Bend, in the county of St.' Joseph, State of lndiana, have invented certain new and useful Tmprovements in Adjustable-Drawing-Board Brackets, of which the following is a specification. Y

This invention relates to a supporting bracket for a drawing board, and an object of the invention is to provide a bracket, comprisinga clamping structure designed for clamping engagement with any article of furniture, such as a table, chair, stand or any suitable permanent support, which bracket has a drawing board supporting head carried thereby and connected thereto by means of an articulated structure to permit adjustment of the position of the drawing board to suit the conveniences of the user.l

Another object of this invention is to provide a bracket as specified, which is comparatively simple in construction, may be manufactured for a relatively lowcost, and one in which the simplicity of its construction rendersv it easy of operation.

Other objects of the invention will appear in the following Ldetailed description, taken in connection with the accompanying drawl ings, forming' a part of thisspecification,

and in which drawings:

Figure 1 is a section through the improved drawing board supporting bracket. Fig. Q is a perspective view of the 4bracket having the board attached and showing the same applied to an ordinary stand. Fig. 3 is a perspective View of the bracket looking at the same vfrom the rear and showing the board attached. Y

Fig. 4 is a perspectiveview showing'the bracket attached to the back of an ordinary chair, and l 'j Fig. 5 is a detail perspective of a coupling employed in the bracket structure.

Referring more particularly to the drawings, 1 indicates generically the clamp structure of the bracket. This 'clamp structure comprises jaws 2 and 3 which have portions of their facing surfaces cut-away to provide sufficient space for A engagement upon the opposite sides ofv a support. These cutaway faces are preferably covered with layers of cloth indicated at 4L, which cloth may be felt, or any Asimilar material to prevent the Y marringv of the article of furniture or 'sup'- port to Vwhich the clamp' is attached. The facingsurfaces of the jaws 2 and 3 are also providedv with substantially semi-cylindrical cut-out portions 5 intermediate the ends of the cut-away portions of their faces so as to adapt the clamp for engagement with a roundsupport.

A clamping screw 6 is carried by the j aw 2, extending through an opening 7 in the upper end ofthe same. The head 8 of thel clamping screw 6 is seated in a countersink 9 formed in the outer face of the jaw 2. The screw 8 extends loosely through the opening 7 and also through an opening 10 formedin the jaw 3. A clamping nut 11 is mounted upon the threaded end 12 of the screw and this nut is preferably constructed of wood and elongated so as-to extend longitudinally. of the Clamping structure to eliminate laterally projecting ends. A packing washer 13 is interposed between the in-- ner face of theclamping nut 11 and the outer face of the jaw 3. v

The jaws 2 and 3 are pivotally connected, by means of bolts 14 and 15 to a Cylindrical arm 16 and these aws have their upper ends recessed for receiving one end of this cylindrical arm 16. Y The bolts 14- and 15 are clamped in place by means of wing nuts 17 so as to permit ofthe free and easy adjustment of the position of the cylindrical arm 16 with respect to the clamping jaws. lf it is desired, the facing surfaces of the jaws may be provided with substantially cylindrical cut-out portions 18 eX- tending longitudinally inl their inner faces and intermediate the edges thereof.

The outer end of the arm 16 is bifurcated and receives between the arm 19 formed thereby, the flat end 20l of the coupling member 21. This flattened end 20 is c connected -to the arm 16 by a' bolt 22, upon the threaded end of which a clamping member 23 is mounted. VThis clamping member 23 has a handle formed thereon to facilitate the rotation thereof to loosen or tighten` the clamping action between the arms '19 and the flattened portion 2O to permit `adjustment of; the coupling member 21 with respect to the'arm 16 or to hold these members4 against independent movement.

A second flat portion. 24: projects upwardly from the couplingmember 21 and it ispositioned at right angles tothe flattened portionVQO. The flat portion 24: is congaging head '33.

nected by means of a bolt to the lower bifurcated end of a second cylindrical arm 26. A clamping nut 27 is mountedv Vupon the threaded end of the bolt 25, and it has a handle 28. formed thereon to facilitate.

the rotation of this clamping nut for binding the arm 29 formed by the bifurcation of the lower end of the arm 26, into engagement with the iiattened portion 2d or to release the binding actionv between theseJ members to permit adjustment of the position of the rarm k26 with respect to the coupling 21.'y

The outer end of the arm 26 is provided with abore 30 extending inwardly thereinto and this bore receives the shank 31 of,

the stem 32 which carries the board en- The end of the arm 26 which is provided with thebore 30 is split at' diametrically opposed points and the portions thus formed are securely clamped about the sliaiik'31` by a clamping structure 311 which includes a metal ring 35 carrying a'set screw 36 which set screw binds against a metal wear plate 37 and by loosening the set screw-36 the shank 31 may be 4 freely rotated within the bore 30.

The head 33 comprises a plurality of arms 38 which radiate from the stem 932 and 'are provided with openings in their outer ends v which receive screws .39 by means of which the Adrawing board 40 is connected to the head 33. The stem 32 projects a short distance beyond the board engaging surfaces of the arms 38 for seating in a suitable recess formed in the -under surface of the board l0 to facilitate the '4 proper positioning of `the board when vconnecting it to the bracket. The stem 32 may be' artistically designed between the shank 31 and the shank 41 which extends through the head 33,' if desired, and it is provided with a shoulder 42 for engagement against the outer end of the arm 26'to` limit the insertion ofthe shank 31 into the bore 30.

The arm 16 may be provided: with two sets of bores Llrextending at right angles 3 to each other to permit of adjusted con- 'outwardly of the cut-out portion in spacedV nection between .this arm and the clamp structurel. s Y

rIhe bolts 14 and 15 hold thev facing surfaces of the jaws 2 and 3 of the clamp 1 relation to facilitate the movement of the jaws into firm clamping engagement with a support. l Y

From the foregoing, it will be seen that a supportingv bracket has beenl provided which willpermit of a wide Vrange of adjusted positioning 'of a drawing board, onel which maybe conveniently carried about, andwhichisadaptable for attachment to any-suitable'support such as an article ofY furnitureyand it is to be understood; that changes in'details .may be made without devparting from the spirit of the invention,

but, Y

I claim: Y 1. In a supporting bracket, the combination, of an arm, a supporting head, a stein tion, of an arm, a. supporting head, a stein connected to saidV head and rotatably connected to said yarm for rotation about an anisv transverse toi the plane; of said' head, said-supporting head. comprising a plurality of rigidly connected radiating arms hav-` ing flat article engaging surfaces, saidstein projecting a short distance beyond the. at

surfaces of said. arm to facilitatecentering.

of a board upon said head', means for holding said stem against rotation*v with respect to said arm,a clamp structure, and anarticulated connection between thel arm .and clamp structure. w Y, f

3. In a supporting bracket, a clamp structure comprising a pair of jawsr having a portion of their facing surfaces cut-away and provided withV centrally disposed lon- Y gitudinally and transversely extending substantially semi-cylindrical cut-out portions, means for holding saidjaws in clamping engagement with the support,=said jawsY provided with recessesin corresponding ends,

an arm seatedV in said recesses and adjust-V ably connected to said jaws, an .article supporting head, and an articulated connection between said-head and said arm.

Y4f. In a supporting bracket, a clamp structure comprising a pair of jaws, means for holding said jaws in clamping engagement with a support,'said.jaws provided -withfrecesses in corresponding ends, an arm seated in said recesses and provided with openings eXtending .therethrough in,` angularly disposed sets, pinsu adapted to extend through. any'set of said openings to adjust-Y ably connect said arm to said j awsan arti,-

cle supporting head and an articulated con- Y Y nection between said head-and arm.

5. In a supporting bracket, a clamp structure comprising Va pair of jaws, `means for holdingsaid jaws in. clamping engagement with aV support, said-jawsprovided with-recesses in corresponding ends, an. arm' seated in said recesses andiadjustably andrpivotally connected to said jaws, said recesses slightly deeper than the diameter of said arm. to permit limited pivotal movement of the arm with-respect to the jaws, said varm adapted to engage rthe inner ends ,of therecesses to limit the pivotal movement of the arm, an article supporting head, and an articulated connection between said head and tion of the arm into binding engagement with said stem.

7 In a supporting bracket, a clamp struc- Copes of this patent may be obtained for ture comprising a pair of jaws, means for holding said jaws'in clamping engagement with a support, said jaws provided with recess in corresponding ends, an arm seated in said recesses and adjustably connected to said jaws, an article supporting head, an articulated connection between said head and arms comprising an arm provided with s. longitudinal recess to receive said stem, said arm being split for the depth of said recess, a wear plate carried by the split end of said arm, a ring encirclin vsaid split end, a set screw carried by sai ring for forcing the split portion'. of the arm into binding en gagement with said stem. Y

THEODORE T. ANDRESIAK.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

